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85201.

AlCl_(3) is covalent and AiF_(3) is ionic. This fact can be explained on the basic of :

Answer»

Crystal STRUCTURE
Fazan RULES
Lattice ENERGY
Valence BOND theory

Answer :B
Discussion
85202.

AlCl_3 is a _________ Lewis acid than BCl_3.

Answer»

SOLUTION :STRONGER
Discussion
85203.

Actinides are known as

Answer»

5-f SERIES elements
`2^(nd)` inner TRANSITION elements
radio ACTIVE elemenrts
all of these

Solution :We know that, all actinides are RADIOACTIVE. The elements bismuth ONWARDS are radioactive.
Discussion
85204.

Actinides are called transuranic elements. Explain.

Answer»

SOLUTION :HEAVIEST naturally available element is URANIUM. ELEMENTS with `Zgt 92` are called transuranic elements. They are all artificial and most of them were synthesised by Seaberg.
Discussion
85205.

AlCl_3 in Friedel-Crafts reaction acts as:

Answer»

OXIDISING agent
Reducing agent
Acid catalyst
None

Answer :C
Discussion
85206.

Actinide series is arises due to

Answer»

stability of 5f-orbitals
stability of 7s-orbitals
stability of 6d-orbitals
equal stability of 6d and 5f-orbitals

Solution :We know that, in `7 ^(th)` row after 7s-orbitals the next electrons enters into 6d-orbitals. At this STAGE 6d-orbitals stop its spliting and 5f-orbitals, split into 7 orbitals, and BECOME lower energy than, 6d-orbitals. Hence 5f-orbitals are progressively filled and 14 NEW ELEMENTS are ADDED called as actinides.
Discussion
85207.

Actinide that is naturally available with highest isotopic number

Answer»

U
Pu
Cu
Fm

Answer :A
Discussion
85208.

AlCl_3 exists in dimer because :

Answer»

AL has GREATER I.P.
Al has LARGER radius
High CHARGE nucleus
Incomplete `RHO`-orbital

Answer :D
Discussion
85209.

Actinide series start from

Answer»

Ac to Lr
TH to Lr
U to Lr
CF to Lr

Answer :B
Discussion
85210.

Actinide from

Answer»

IONIC COMPOUNDS
COVALENT compounds
co-ordinate compounds
chalates

ANSWER :B
Discussion
85211.

AlCl_(3) behaves like a lewis acid. Substantiate this statement.

Answer»

Solution :In `AlCl_(3)`, AL in electron DEFICIENT it needs two electrons to complete octet so it ACT as lewis ACID `AlCl_(3)` usualy exist as a DIMER to achieve octer by bridged Cl atom electrn deficient compounds are lewis acids.
Discussion
85212.

AlCl_(2) is solubleis axcessof NaOH formingsodiummetaaluminate Na[Al(OH)_(4)].

Answer»


Solution :`AICI_(3) + NaOH RARR 3NaCI + AI(OH)_(3) DARR`
`AI(OH)_(3) + NaOHrarr underset("Soluble")(Na[AI(OH)_(4)])`
HENCE true.
Discussion
85213.

Acrylonitrile is the other name of

Answer»

`H_2C=CHCl`
` H_2C =CHOH`
` H_2C =CHC_6H_5`
` H_2C= CHCN`

ANSWER :D
Discussion
85214.

Albuterol (used in some commonly prescribed respiratory medications) and vanillin (from vanilla beans) each contain several functional groups. Name the functional groups in albuterol and vanillin and, if appropriate for a given group. classify them as primary (1^(@)), secondary (2^(@)), or tertiary (3^(@)).

Answer»

SOLUTION :Albuterol has the FOLLOWING FUNCTIONAL groups: `1^(@)` alcohol, `2^(@)` alcohol, phenol, and `2^(@)` AMINE. VANILLIN has aldehyde, ether, and phenol functional groups.
Discussion
85215.

…………...act as shock absorber and lubricant

Answer»

SOLUTION :hyalronate (or) GLYCOSAMINOGLYCANS
Discussion
85216.

Albumin protein are most abundant in

Answer»

Meat
Milk
EGG
SOYABEAN

ANSWER :C
Discussion
85217.

Acrylic resins are

Answer»

Colourless and transparent
DARK BROWN and thermosetting
Darkbrown and THERMOPLASTIC
White like MILK

ANSWER :A
Discussion
85218.

Acrylic acid reacts with HBr to give :

Answer»

`BR-CH_(2)underset(Br" ")underset(|" ")(CH)-COOH`
`Br-CH_(2)-CH_(2)-COOH`
`CH_(2)=CHCOBr`
`CH_(3)-underset(Br"")underset(|"")(CHCOOH`

ANSWER :B
Discussion
85219.

Albumin is a _____ type protein.

Answer»


ANSWER :GLOBULAR
Discussion
85220.

Across the lanthanide series, the basic strength of the lanthanide hydroxides

Answer»

INCREASES
DECREASES
FIRST increases and then decreases
First decreases and then increases

Answer :B
Discussion
85221.

Alanyl glycine is ______.

Answer»

DIPEPTIDE
tripephide
POLYPEPTIDE
NUCLEIC ACID

SOLUTION :dipeptide
Discussion
85222.

Acrosols reduce primary productivity by

Answer»

Destroying LEAF tissue
Premature leaf fall
Reducing crop yields
All of these

Solution :Aerosol is PRODUCED by jet aeroplanes, trucks and other vehicles . It can DECREASE the GROWTH and productivity of plant and also cause abscission of leaves.
Discussion
85223.

Alanine is :

Answer»

an enzyme
purine BASE of nucleic ACID
`alpha`-AMINO acid
HORMONE .

Answer :C
Discussion
85224.

Acrolein test is positive for:

Answer»

POLYSACCHARIDES
proteins
oils and fats
reducing SUGARS

ANSWER :C
Discussion
85225.

Alane is chemically:

Answer»

`AlH_3`
`(AlH_3)_n`
`LiAlH_4`
None

Answer :B
Discussion
85226.

Acrolein test is positive for

Answer»

Polysaccharides
Proteins
Oils and fats
Reducing sugars

Solution :When a fat is heated strongly in the PRESENCE of a dehydrating agent such as `KHSO_(4)`, the GLYCEROL portion of the molecule is dehydrated to FORM the unsaturated aldehyde acrolein, `CH_(3)CH=CHCHO`, which has the peculiar odour of burnt grease. This is the standard TEST for fats.
Discussion
85227.

Al^(3+) has a lower radius than Mg^(2+) ion because

Answer»

Mg atom has less number of neutron than Al
`Al^(3+)` has higher nuclear CHARGE than `Mg^(2+)`
their electronegatives are different
Al has a lower IONIZATION potential than Mg atom.

Solution :`Al^(3+)` has a higher nuclear charge `(+13)` than `Mg^(2+) (+12)`.
Discussion
85228.

Acrolein on reduction by using H_2/Ni gives

Answer»




ANSWER :A
Discussion
85229.

Al^(3+)(aq)+3e^(-) rarr Al(s)E^(@)=-1.66V Cu^(2+)(aq)+2e^(-) rarr Cu(s)E^(@) = + 0.34V What voltage is produced under standard conditions to give a spontaneous reactions by combination of these two half-cells ?

Answer»

1.32 V
`-1.32V`
2.00 V
`-2.00V`

ANSWER :C
Discussion
85230.

Acrolein on complete reduction gives:

Answer»

ALLYL alcohol
Propan-1-ol
Propanal
None

Answer :B
Discussion
85231.

Al_(2)O_(3) to AlN to A(OH)_(3) toAl_(2)O_(3). The sequence of these products involved in

Answer»

Bayer's PROCESS
Serpecks process
Hall's process
Hope's process

Solution :The Serpeck.s process is `Al_(2)O_(3)+3C+N_(2) overset(180^(@)C) to 2AIN+3CO`
`SiO_(2)+2C to Si+ 2CO`
`AIN+3H_(2)O to Al(OH)_(3)+NH_(3)`
`2Al (OH)_(3) overset(DELTA)to Al_(2)O_(3)+3H_(2)O`
Discussion
85232.

Al_(2)O_(3) to AIN to Al(OH)_(2) to Al_(2)O_(3). The sequence of these products involved in

Answer»

BAYER's PROCESS
Serpeck's process
Hall's process
Hoope's process

Answer :B
Discussion
85233.

Al_(2)O_(3)+N_(2)+Crarr X+CO, X+H_(2)Orarr Y+Z 'Y' is an amphoteric substance. When aqueous 'Z' is treated with AICI_(3) solution again 'Y' is formed. What are X, Y and Z?

Answer»

Solution :`X = AlN`, which on hydrolysis gives Al(OH), and AMMONIA. `Y = Al(OH)_(3) and Z=NH_(3)`
Ammonium chloride precipitates ALUMINIUM hydroxide with aqueous ammonia.
`AlCl_(3)+3NH_(4)OH rarr Al(OH)_(3)+3NH_(4)Cl`
Discussion
85234.

Acrolein is obtained when glycerol is dehydrated with :

Answer»

`KHSO_4`
`P_2O_5`
CONC.`H_2SO_4`
All are correct

Answer :D
Discussion
85235.

Al_(2)O_(3) is reduced by electrolysis at low potentials and high currents. If 4.0xx10^(4) ampere of current is passed through molten Al_(2)O_(3) for 6 hours, what mass of aluminium is produced ? (Assume 100% current efficiency. At. Mass of Al=27g mol^(-1))

Answer»

`8.1xx10^(4)g`
`2.4xx10^(5)g`
`1.3xx10^(4)g`
`9.0xx10^(3)g`

Solution :`Al^(3+)+3e^(-)toAl`
QUANTITY of electricity PASSED
`=(4.0xx10^(4)A)xx(6xx60xx60s)`
`=864xx10^(6)`coulombs
3F, i.e., `3xx96500C` produce `Al=1` mole, i.e., 27g
`therefore864xx10^(6)C` will produce Al ltbRgt `=(27)/(3xx96500)xx864xx10^(6)g`
`=8.058xx10^(4)g=8.1xx10^(4)g`.
Discussion
85236.

Acrilon is hard , horny and a high melting material . Which of the following represents its structure ?

Answer»




ANSWER :A
Discussion
85237.

Al_2O_3 formation involves large quantity of heat evolution which makes its use in :

Answer»

Deoxidiser
Thermite welding
Confectionary
INDOOR photography

Answer :B
Discussion
85238.

Acrilan is a hard, horny and a high melting material. Which of the following represents its structure?

Answer»

`(--CH_2- underset(COOCH_3)underset|overset(CH_3)overset|C--)_n`
`(--CH_2-underset(COOC_2H_5)underset|CH--)_n`
`(--CH_2-undersetunderset(CL)|CH--)_n`
`(--CH_2-undersetunderset(CN)|CH--)_n`

ANSWER :D
Discussion
85239.

Al_(2)O_(3)+C+N_(2)overset(Delta)to X+Y. If X is a solid and Y is a gas, the correct statement is

Answer»

Both X and Y are combustable
X and hydrolysis gives AMMONIA
Y on reduction gives METAL
Both X and Y are ACIDIC

Answer :2
Discussion
85240.

Acrilan is a hard , horny and a high melting material. Which of the following represents its structure ?

Answer»




ANSWER :A
Discussion
85241.

Al reduces most of the metallic oxides due to its greater affinity for :

Answer»

Metals
Oxygen
Electrons
Protons

Answer :B
Discussion
85242.

Acrilan is a hard , horny and a high melting material. Its stucture is

Answer»




SOLUTION :Acrilan is a CYANIDE COMPOUND. The structure is `[--CH_(2)-underset(CN)underset(|)(C)H--]_(N)`
Discussion
85243.

Acrilan fibre used for cloth, carpets and blankets, it the polymer of

Answer»

acrylonitrile
ethylacrylate
styrene
monochlorotrifluoro ethane

Answer :A
Discussion
85244.

Al (OH)_(3) is also used like which of the following to neutralise exucess acid in the gastric juice?

Answer»

`NaHCO_(3)`
`MgCO_(3)`
ALUMINUM phosphate
All of these

Answer :D
Discussion
85245.

Acquired immune deficiency syndroms (AIDS) is characterised

Answer»

Killer T-cells
Reduction in number of helper T-shells
An AUTOIMMUNE disease
Inability of BODY to PRODUCE interferons

Answer :B
Discussion
85246.

Al element X belongs to fourth period and fifteenth group of the periodic table. Which of the following statements is true?

Answer»

It has a completely FILLED s-orbital and a partially filled d-orbital
It has completely filled s- and p- ORBITALS anre a partially filled d-orbital
It has completely filled s- and p- orbitals and a half filled d-orbital.
It has a half-filled p-orbital and completely filled s- and d-orbitals.

Solution :Element X is arsenic (As) and its electronic configuration is `[AR]3d^(10) 4s^(2) 4p^(3)`.
Discussion
85247.

Al dissolves in molten NaOH with the formation of :

Answer»

ALUMINIUM hydroxide
SODIUM META ALUMINATE `(NaAlO_2)`
Sodium aluminate `(Na_3AlO_3)`
Alumina

Answer :C
Discussion
85248.

Acqueous solution of nickel sulphate on treating with pyridine and then adding a solution of sodium nitrate gives dark blue crystals of

Answer»

`[NI(PY)_(4)]SO_(4)`
`[Ni(py)_(2)(NO_(2))_(2)]`
`[Ni(py)_(4)](NO_(2))_(2)`
`[Ni(py)^(3)(NO_(2))_(2)]SO_(4)`

SOLUTION :`NiSO_(4)+4py+2NaNO_(3)toNa_(2)SO_(4)+underset("Blue")([Ni(py)_(4)](NO_(2))_(2))`
Discussion
85249.

Al-Bronze contains Al and :

Answer»

Zn
Sb
Ni
Cu

Answer :D
Discussion
85250.

(a)Copper-Least reactive (b)Clay-Mineral of Al (c )bauxite-Mineral of Al (d)Gangue-Impurity

Answer»

SOLUTION :(C )Bauxite-Mineral of AL
Discussion